Help with player movement and jumping

Hi, I have a basic camera system using Cinemachine and I am having problems with my jumping when I use the Kinematic tickbox as in it doesn't work. However, if I don't tick the Kinematic tickbox I get all of these weird camera flickers and glitches as shown in this video

This is the code for my player:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class ThirdPersonMovement : MonoBehaviour
 {
     public CharacterController Controller;
     public Transform Camera;
     public Rigidbody RB;
 
     public float Speed = 6f;
 
     public float TurnSmoothTime = 0.15f;
     float turnSmoothVelocity;
 
     public float JumpForce = 5f;
     bool CanJump = true;
 
     private void Start()
     {
         RB = GetComponent<Rigidbody>();
     }
 
     // Update is called once per frame
     void Update()
     {
         float horizontal = Input.GetAxisRaw("Horizontal");
         float vertical = Input.GetAxisRaw("Vertical");
         Vector3 direction = new Vector3(horizontal, 0f, vertical).normalized;
 
         if (direction.magnitude >= 0.1f)
         {
             float targetAngle = Mathf.Atan2(direction.x, direction.z) * Mathf.Rad2Deg + Camera.eulerAngles.y;
             float angle = Mathf.SmoothDampAngle(transform.eulerAngles.y, targetAngle, ref turnSmoothVelocity, TurnSmoothTime);
             transform.rotation = Quaternion.Euler(0, angle, 0);
 
             Vector3 moveDir = Quaternion.Euler(0f, targetAngle, 0f) * Vector3.forward;
             Controller.Move(moveDir.normalized * Speed * Time.deltaTime);
         }
 
         //Jumping
         if (Input.GetButtonDown("Jump") && CanJump)
         {
             RB.AddForce(new Vector3(0, JumpForce, 0), ForceMode.Impulse);
             CanJump = false;
         }
     }
 
     private void OnCollisionEnter(Collision collision)
     {
         if (collision.gameObject.tag == "Platform")
         {
             CanJump = true;
         }
     }
 }
 

Please help :(